David Moyes commented: "I have worked with Marouane for five years and I’m delighted he has decided to join Manchester United. He is a player with great ability and strength and I think he will make a real difference to our squad."

Speaking to the club's official website, Fellaini added: "I am thrilled to sign for Manchester United. I have known the manager for many years now and I have a lot of respect for his way of working.

"When I was given the opportunity to work with him again, I jumped at the chance. I had a fantastic time at Everton and I’d like to thank all the fans and staff there for everything they have done for me.

"But being a Manchester United player is something that every player dreams of and I believe that I can make a real contribution to the team’s efforts to win trophies in the future."

United had also hoped to sign Leighton Baines from Moyes's former club but the Toffees rebuffed their advances throughout the summer, with the Premier League champions never meeting their £20m valuation of the left-back.